ИСТИНА

Comparative analysis is provided for radiocesium (134Cs and 137Cs) distribution between particulate and dissolved forms and wash-off parameters for rivers and surface runoff in Fukushima and Chernobyl contaminated areas for the first 3 years after the accidents. It is found that radiocesium distribution coefficient Kd in Fukushima area is essentially higher (1-2 orders of magnitude) than correspondent values for rivers and surface runoff of the Chernobyl zone. Quantitative characteristics of dissolved and particulate radiocesium wash-off from contaminated watersheds after the FDNPP accident are calculated based on available monitoring data. Normalized dissolved wash-off coefficients for Fukushima river watersheds are 1-2 orders of magnitude lower correspondent values for Chernobyl zone. Normalized particulate wash-off coefficients are comparable for Fukushima and Chernobyl.